My sago palm is turning yellow own spine of leaves. It is in a large pot and gets water once a week. What can I do to correct this?

The leaves of my sago palm are turning yellow down the spine. It is in a large pot and gets water once a week. How can I correct this?

Cycas revoluta known as King Sago Palms.
Frequently asked questions

Be aware that the natural course of leaves on plants, including palms and cycads, is first green, then turning yellow, and finally brown and dry

The yellow stage is where the frond is losing its chlorophyll as it is being re-absorbed into the plant. The final brown stage is the completion of the nutrients re-absorption process

So... if you cut off sago fronds too soon, you are actually depriving your sago palm of its natural technique to conserve nutrients. Best is to wait until a frond is totally brown and shriveled up small

The exception to not being worried about yellow or brown fronds on your sago palm is if they are occurring in the center "new growth" area

If new fronds soon turn yellow and head for brown, you have a nutrition problem. You are not feeding properly. Sometimes a sago may take a year or two or more to develop the "quick yellowing" symptom. Don't let that fool you. Food is the answer

Bugs may also be the problem, but not nearly as likely as improper feeding. Poor drainage may also be the problem, but not if your sago palm is well established in its location. Newly planted in your soil or a pot, poor drainage is a suspicion. A final suspicion for newly planted sago is that you planted it too deep

If your sago has been established in its pot for a long time, it most likely is suffering a lack of proper nutrition. This is common for a potted sago as there is a limited soil content in which to draw nutrients. There is also a point in which the plant out-grows the pot, so you may need to transplant into a larger pot. Let transplanting be your last option though in order to limit the stress on the plant. Go to your local nursery (not a Home Depot or Lowe's) and ask them for food for the sago.

Good luck!